
let studentArray = [{"code":"003","name":"刘德华","age":12},
  {"code":"006","name":"李典","age":15},
  {"code":"008","name":"刘军","age":13},
  {"code":"001","name":"李勇","age":9},
  {"code":"009","name":"刘兵","age":10},
  {"code":"010","name":"刘一手","age":6},
  {"code":"002","name":"李儒","age":17},
  {"code":"021","name":"李三","age":18},
  {"code":"015","name":"刘玲","age":7}
];